Nam Kee, Norman Kiak, and Noel Kok Hwee Chia. “Teaching Arithmetic Operation of Division With Montessori Division Board Set to Two Children With Autism Spectrum Disorders: A Case Study”. Journal of the American Academy of Special Education Professionals 5, no. 2 (June 15, 2010): 157–171. Accessed September 23, 2025. https://www.aasep.org/article/view/111.